In this photo provided by the Ukrainian Presidential Press Office, Ukrainian president Volodymyr Zelenskyy poses for a selfie with a soldier at a position in Avdiivka, Donetsk region, Ukraine, Tuesday, April 18, 2023. (Photo by Ukrainian Presidential Press Office via AP Photo)





Ukrainian artillery unit operates from muddy trenches near the frontline during heavy fighting amid Russia's attack on Ukraine, close to Bakhmut, Ukraine on April 13, 2023. (Photo by Kai Pfaffenbach/Reuters)





Faithful are sprinkled with holy water by Ukrainian military chaplain Dionisii, as he holds a service for servicemen and civilians to celebrate Orthodox Easter on the streets of Druzhkivka, Ukraine on April 16, 2023. (Photo by Kai Pfaffenbach/Reuters)





A Ukrainian service member walks near damaged residential buildings in the front line town of Bakhmut, Ukraine on April 21, 2023. (Photo by Anna Kudriavtseva/Reuters)





A serviceman of Ukrainian 80th separate airborne assault brigade, plays accordion during the rest on the front line near Bakhmut in Donetsk region on April 18, 2023, amid the Russian invasion of Ukraine. (Photo by Anatolii Stepanov/AFP Photo)





Artillerymen of Ukrainian 80th separate airborne assault brigade, rest on the front line near Bakhmut in Donetsk region on April 18, 2023, amid the Russian invasion of Ukraine. (Photo by Anatolii Stepanov/AFP Photo)





An artilleryman of Ukrainian 80th separate airborne assault brigade is seen from his car on the front line near Bakhmut in Donetsk region on April 18, 2023, amid the Russian invasion of Ukraine. (Photo by Anatolii Stepanov/AFP Photo)





A Ukrainian serviceman flashes a victory sign as he drives towards the frontline during heavy fighting at the frontline of Bakhmut and Chasiv Yar, in Chasiv Yar, Ukraine, April 12, 2023. (Photo by Kai Pfaffenbach/Reuters)





A serviceman of Ukrainian 80th separate airborne assault brigade, stands next to a car on the front line near Bakhmut in Donetsk region on April 18, 2023, amid the Russian invasion of Ukraine. (Photo by Anatolii Stepanov/AFP Photo)





Ukrainian service members from a 3rd separate assault brigade of the Armed Forces of Ukraine, fire a howitzer D30 at a front line, amid Russia's attack on Ukraine, near the city of Bakhmut, Ukraine on April 23, 2023. (Photo by Sofiia Gatilova/Reuters)





Artillerymen of Ukrainian 80th separate airborne assault brigade rest their rifles against their car on the front line near Bakhmut in Donetsk region on April 18, 2023, amid the Russian invasion of Ukraine. (Photo by Anatolii Stepanov/AFP Photo)





Artillerymen of the Ukrainian 80th separate airborne assault brigade fire from a BM-21 Grad multiple rocket launcher towards Russian positions on the front line near Bakhmut in the Donetsk region, on April 18, 2023, amid the Russian invasion of Ukraine. (Photo by Anatolii Stepanov/AFP Photo)





Ukrainian soldiers fire howitzer D-30 at the frontline near Bakhmut, Donetsk region, Ukraine, Wednesday, April 19, 2023. (Photo by Roman Chop via AP Photo)





A Ukrainian artilleryman of the Aidar battalion holds an artillery shell on a front line position near Bakhmut, Donetsk region, on April 22, 2023, amid the Russian invasion on Ukraine. (Photo by Anatolii Stepanov/AFP Photo)





Chaplain Yuriy Potykun blesses soldiers on the eve of Orthodox Easter, at position of Ukrainian troops in Kharkiv region, on April 15, 2023, amid Russia's military invasion on Ukraine. (Photo by Sergey Bobok/AFP Photo)